1 /* Copyright The libuv project and contributors. All rights reserved.
2 *
3 * Permission is hereby granted, free of charge, to any person obtaining a copy
4 * of this software and associated documentation files (the "Software"), to
5 * deal in the Software without restriction, including without limitation the
6 * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
7 * sell copies of the Software, and to permit persons to whom the Software is
8 * furnished to do so, subject to the following conditions:
9 *
10 * The above copyright notice and this permission notice shall be included in
11 * all copies or substantial portions of the Software.
12 *
13 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
14 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
15 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
16 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
17 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
18 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
19 * IN THE SOFTWARE.
20 */
21
22 #include "uv.h"
23 #include "task.h"
24
25 #include <stdio.h>
26 #include <stdlib.h>
27 #include <string.h>
28
29 static uv_udp_t server;
30 static uv_udp_t client;
31 static uv_check_t check_handle;
32 static uv_buf_t buf;
33 static struct sockaddr_in addr;
34 static char send_data[10];
35 static int check_cb_called;
36
37 #define N 5
38 static int recv_cnt;
39
alloc_cb(uv_handle_t * handle,size_t suggested_size,uv_buf_t * buf)40 static void alloc_cb(uv_handle_t* handle,
41 size_t suggested_size,
42 uv_buf_t* buf) {
43 static char slab[sizeof(send_data)];
44 buf->base = slab;
45 buf->len = sizeof(slab);
46 }
47
sv_recv_cb(uv_udp_t * handle,ssize_t nread,const uv_buf_t * rcvbuf,const struct sockaddr * addr,unsigned flags)48 static void sv_recv_cb(uv_udp_t* handle,
49 ssize_t nread,
50 const uv_buf_t* rcvbuf,
51 const struct sockaddr* addr,
52 unsigned flags) {
53 /* |nread| can be zero when the kernel drops an incoming datagram after
54 * marking the file descriptor as readable but before libuv has a chance
55 * to receive it. Libuv still invokes the uv_udp_recv_cb callback to give
56 * back the memory from the uv_alloc_cb callback.
57 *
58 * See https://github.com/libuv/libuv/issues/4219.
59 */
60 recv_cnt++;
61 if (nread > 0)
62 ASSERT_EQ(nread, sizeof(send_data));
63 }
64
check_cb(uv_check_t * handle)65 static void check_cb(uv_check_t* handle) {
66 ASSERT_PTR_EQ(&check_handle, handle);
67
68 /**
69 * sv_recv_cb() is called with nread set to zero to indicate
70 * there is no more udp packet in the kernel, so the actual
71 * recv_cnt is up to one larger than N. UDP being what it is,
72 * packets can get dropped so don't assume an exact count.
73 */
74 ASSERT_GE(recv_cnt, 1);
75 ASSERT_LE(recv_cnt, N+1);
76 check_cb_called = 1;
77
78 /* we are done */
79 ASSERT_OK(uv_check_stop(handle));
80 uv_close((uv_handle_t*) &client, NULL);
81 uv_close((uv_handle_t*) &check_handle, NULL);
82 uv_close((uv_handle_t*) &server, NULL);
83 }
84
85
TEST_IMPL(udp_recv_in_a_row)86 TEST_IMPL(udp_recv_in_a_row) {
87 int i, r;
88
89 ASSERT_OK(uv_check_init(uv_default_loop(), &check_handle));
90 ASSERT_OK(uv_check_start(&check_handle, check_cb));
91
92 ASSERT_OK(uv_ip4_addr("127.0.0.1", TEST_PORT, &addr));
93
94 ASSERT_OK(uv_udp_init(uv_default_loop(), &server));
95 ASSERT_OK(uv_udp_bind(&server, (const struct sockaddr*) &addr, 0));
96 ASSERT_OK(uv_udp_recv_start(&server, alloc_cb, sv_recv_cb));
97
98 ASSERT_OK(uv_udp_init(uv_default_loop(), &client));
99
100 /* send N-1 udp packets */
101 buf = uv_buf_init(send_data, sizeof(send_data));
102 for (i = 0; i < N - 1; i ++) {
103 r = uv_udp_try_send(&client,
104 &buf,
105 1,
106 (const struct sockaddr*) &addr);
107 ASSERT_EQ(sizeof(send_data), r);
108 }
109
110 /* send an empty udp packet */
111 buf = uv_buf_init(NULL, 0);
112 r = uv_udp_try_send(&client,
113 &buf,
114 1,
115 (const struct sockaddr*) &addr);
116 ASSERT_OK(r);
117
118 /* check_cb() asserts that the N packets can be received
119 * before it gets called.
120 */
121
122 ASSERT_OK(uv_run(uv_default_loop(), UV_RUN_DEFAULT));
123
124 ASSERT(check_cb_called);
125
126 MAKE_VALGRIND_HAPPY(uv_default_loop());
127 return 0;
128 }
129
